CrowdStrike, the cybersecurity company at the center of massive global IT outages, blamed the meltdown on a bug in quality control software that allowed bad data in an update to be sent to millions of computers running Microsoft Windows.
About 8.5 million Windows machines across the globe crashed on July 19, forcing airports to ground flights, taking TV broadcasts off the air, and disrupting banks, hospitals, and the London Stock Exchange, among others. Some affected businesses, notably Delta Air Lines, are still struggling to recover.
